(There is no universally-used term for this kind of music, but at least one reference calls it by this name, so this is the name under which I put it. Another name sometimes used is mainstream pop music.)

(Note that the Jimmie Rodgers mentioned above is not to be confused with an earlier country music singer of the same name. He, Connie Francis, and The Vogues were from a somewhat later era than most of the singers listed above; however, their style is closer to traditional pop than to the rock and roll typical of their era.)

Sometimes this music is considered "easy-listening music[?]," but there is at best a large overlap between the two.